Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5b06358f537fc2c314cdb8d4f91894b9cb79ddb99b0a809e6a962af6c7d3802' 
  AND token = 'fTrzH0413nhsFzsaVw1+N2ytdSV/P5ynQFN6FhR4aRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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