SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a37a41c332f0b85e25468c228eb59dc94a1b6084010e78a6cfbaf6e0aa9c0b0' 
  AND token = 'KJBImRaH+wA4JaUJQcmQG35MjpVtOG5FKgLAOXSxBfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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