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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1b709c750eaf060d85b6146163211c45bc2a6cba5cb57c08fa3fc94cf9147cc' 
  AND token = '2tLOQ5cdfQz1KrGtCqsc3CwzZrBAjamagFGpK7dQ7Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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