SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8a713ccf1aa048e25ea245a83562707bf417f9d69edb821dc70a2411f20745e' 
  AND token = 'KyUQCT49DMwddBKKf0vhIg4rwuAFQZBmXec+q5Hi+JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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