SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b96c236f6a80c03b923bd691b6bfc5f6a452e6cdb664052837f91f56e74fa4c' 
  AND token = 'msn/W0wy+tIBO03XnD3WLE55Z9mwAHCKGq+xiOgQumo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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