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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d76630c0a3bc873e71aedd825e37c90128de64708c85b4abda92c6349af2a9' 
  AND token = 'OeLEcSlJPXRU1lrxc9O6X2yTdi2ngmGWK1A4Q4gy8No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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