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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14c5ccad895f29640f8d450d9fd3d9a04713383f6919e215c8914390bc7cf3f9' 
  AND token = '3/7l7N5mPbiewMatqxytA5UXSQpOz4rWO27HnVeOFnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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