SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '296bd7d55e4abd2d77a594ccbaedb93a71c7f75d38be5b451916146f711f4323' 
  AND token = '/zp4HV6Ylflq2Gi5FEszXe3X0LQUP/NqrxKrDUIhza8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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