SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '938d6a24be16034153eaf78cd7a1d4306a069008c5b08fadf77e8f678ab520ea' 
  AND token = 'nWa1mVl+Y8Q1l1lgzg9HSh5BlWwuWvPZUo+KxZXChPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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