SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf64821ff71952d082c1bb1c5da46bed8610423e4b5ab4986e5ad4fd70cb0db3' 
  AND token = 'AaIYZ73BS9q4F+6Ewglu+ymoEEfiE7idrRBJKVwtggM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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