SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e1dc6e6490b8664f83e23d8ab74d173224f8310cd508f7bea313504ffc86a5e' 
  AND token = 'VEhbrv/v/You85+SLuvj8KzFr7ZlrWdmnSEvZyWDGM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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