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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ba814e0fd80659ab517de88c1d6da4736c26ba6a6e65352ca9a1c8efa1a8d8' 
  AND token = 'yKhjxCk6XKy6OGHrLNWv1eMfHZBQ7lo4bQGenAFM2+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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