SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15f983a2b7bcd4d88de56d936c01f115ad7b5dee309128ad0b915f777fbdf0eb' 
  AND token = 'sIl2qVMb0O/jtXaTU+ehGHbNA9hCZrWwFdvvP67OluE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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