SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf22319977b45bd9c6278d2a6a577bb23541f36f4b2a203723b3d73d4569ae7e' 
  AND token = 'slmaFIGsvOQa/wrnDQIXUqsDzj6gOhInirZ75wyQIV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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