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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3d6f2b8586bbeeabbcabd0edb1c6599cf86c783b759ca2939b88e2bbee033f' 
  AND token = '6NY7wGCb7bPINkaevbyMQtahQzWr4nqy8c8ZBhh54tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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