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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ebff7a060d5f700ecdb84ef413197c9e0a5eeaf45f1db368fde9ecf1e36708b' 
  AND token = 'E7A99dv/9UwvpmFLOR078wfCIFXBnrsD8MvINAYgOCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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