SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a0272509f91b94cfe0e61461c7ff9863d21fdf859282b3061830c328558b94c' 
  AND token = 'Ajjclbr62jmkST5vLzGJY9iq9N96E+2YmZcUZGWVlnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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