SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa3a4f308e8d723d38b4fc6a05c438b17c46871569a9e8ce0167df0ec920e158' 
  AND token = '7R+6Iv1hR1KXs/QBm+kx4F5W+joBPuMdhzlg0mkR1b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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