SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a99cd0d86dad4d6e15a4a65623c58b075a162baa0793055e53bd86903f34c8bb' 
  AND token = '1nPqHC1BoAGqaSoUoUb35hjpP2VOZlhURskwfJljjlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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