SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '362532462e57bc507d13ceaad85872244c45ec471681920db9f9087e689c7b94' 
  AND token = 'FZJND6Br+oIZTghcRBNtPBAFeKK4ptU8UL7vSIGxo74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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