SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '995e9cf1857f5314e06811078606038468c72d138061268441d2e20fb1779ffa' 
  AND token = 't4Z/Tfy90csCVnd5DwZ+t+r6GyLns5nYuBmDiz3pMuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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