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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a4fa9e104bd80cc1f937aa77255cf5429725ece47f4d1332237196759ad904b' 
  AND token = '/rvUSkP7YcCpKUp5Ta+RdjtjPUEaWTgQZc4G9gMMCAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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