SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a94105fe9702bdef4bd99814be82d894c7c659b8726be340674ce763b55823c' 
  AND token = 'MFx3cwvJ2XQ9hhasfTfiODD/wh6jqO/QvjaCdVgoSig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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