SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b97b2ad9b0bfe76baa3a29036c6a9621b816c1491b6df94588b8bae6f36f747' 
  AND token = 'LzXRwtOPKdgOHilzVac3CwaTLpD1hv8Aw1r2SG7B3tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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