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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c8275cd069e94ba4c712cd9af9225cfdb8c1e942bcc0056e44c1e7e05d58cbb' 
  AND token = 'gPu79grTfmxIDrcamcxhYhrOcO5v6iPmBre02ia1J+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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