SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34d24e57540b34aac69019db5555c95b31c535937926da1bdf9aad059b2512c3' 
  AND token = 'FVM8kn6zqwd6LqW+fT4kpNCPL4sjfjIIJc/9vgaEtYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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