SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '650e6233c042752534a524f7e10ae0a388da95e2bd2f9be35c48ad19f964094b' 
  AND token = 'YC0Jnmc0ZNJQlMiR9/vICgxZpC3VoJnLhLBHYYoGT8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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