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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '466d8d99ea83e0909c5089825fab4c8aa11570d321cb5f65cbe52f8a914a0633' 
  AND token = 'PILQCEy2N8sIFDJP5kC4ygvNprMr8ug1R1WsARjH88Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}