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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00c063c35e0401b5a10a00b80f630e4770cda489b5104dcf46be9989caf3edbd' 
  AND token = 'XyiO9H7DaostWHUa1RI6YxnSraiLvEO3WjTLv1piaA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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