SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87ee9920a9332dd22a1ca283e0f33e3187ff984f7aa3b22bfbc661311788bd22' 
  AND token = 'xj5qygV2XAdphQtqZ4vFjwLW/B/STnaZDCD7V+8h9tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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