SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad2edd512f2f94c6b6b9d38df057e0b12f094263cc40e32f01810f971443efed' 
  AND token = 'scpoogJ9hbpA8aZw1vJmRbvPHMF/tB/aGIUPKWz0l3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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