SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '287f32191675ab4d5ae4f0b17f293acf68a764a2515ff6ae0014dbe56ebcf44e' 
  AND token = '1pwya8Y2M17+k/Kj3oxYgFnqC68q9/PDAYOcrFTRqJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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