SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '454288a43c5689aee51c324ba9224deed0ab7659a92ba5b68c1c2704b84c295e' 
  AND token = 'iUuAQwqW9VyLggmOlm7L9uQYgXEvjlSU6knBH/Q3bKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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