SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d9064caf7966d837c1361152925cd044d0e8f77edb3a0c07c04b6dce4a81630' 
  AND token = 'KnMCQyfz+GWpvIbg3G+mW2czMlBwCPHvj+NGwJW7zFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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