SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23e98db2cf4d2ba32af6e4aabb676a134fc11f02dde4c637259fa54a89588169' 
  AND token = 'vX8+V9iWCG6eNhxS+UXqmIl/QFQ093vCPQPDCksQNCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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