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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2c336427665d10bbec4f43ed77091ad88567f25b0ba844726e03090c8660bd9' 
  AND token = 'nwTEyPMzr1zTlTlCPyD5Q/PPhECmshFY5Qq93t9TpKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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