SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cd377a6d7a02bd11b7c8548984db1cc1d82451741e3081e9ac779743e3369a7' 
  AND token = 'uMLW2DJi9tXhS+gwvpnVJE7wrkr/0f9NYBZzQSOyWzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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