SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c72fb1ff317260680a27200d7162bc2800afa2533cfc25bd3b1689ac1546b0c1' 
  AND token = 'Ez4jg1J+X3grThV9NPRylS1KdvVAwfzf6ki015WPvIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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