SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a177d9e5d1d9cff09a40549162a4b8f3d136dce6e38972f7502cb7c50640c7d3' 
  AND token = 'gmHhOnzu4ZQrfyinuFBZP6u/56VQIDj1woGFKZ52nmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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