SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97617ec10d08dc67397ac8c0c5649e6f8c8981b2f0f79d96554b5f68ee2458fb' 
  AND token = 'Q7S2m5R+nBaxya6IHo+HBXXwZvdSfOg8JUQ7zGaFQHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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