SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2be5e2284730ee7783486ea726824fc3f44234396c59ea07db452251efa36923' 
  AND token = 'VVFUZjMhf9oMJzEQ3ejIKIJh5zJ7dJ/dYC10ACugshs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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