SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99c18676de9a4f570c969d7a22ff78d2b2b77307271c9b82ae883c49709781e' 
  AND token = 'K6Kt953KIgvi51IS22xZjMmozBi1/Cn4xkhQKHM+yfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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