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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19015199dcb19cf3a33fb05d65d816f360c1fb3c950d76b8ef5043baefc9f2e9' 
  AND token = '8/29NeIGLQCSxm0HONsDWv2i+76x5SL8qyavVmEySag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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