SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06ccbfd09f3f49c45c4485071eac2791483ae32990cc7736bab2ff46eae488b8' 
  AND token = 'OzpYdW0aEWBPT5+jBsUxVRNmHkRCTYEqSrvkAXXSQfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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