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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca4078b1c2a6f4d24cac6e7c6358a1172eaafbd0e780e4852761d5cc7b7ff58b' 
  AND token = '+qWK1S12J4Z6CJgMb1NapK08r+wifsnFzr1JLY79YQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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