SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3212f3a897213d8008452bd88abd7525cebf921c955295f7d3ee4a7d6de7e528' 
  AND token = 'fbPXYfRJ9ww3gZX35Vf6YYUOnZQZ/ymOUp+zwo5fuv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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