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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb63a9ee2ad67cef28c42cd31e36ea8f11c22b96d9719e917d90b7ab3dd7f6a5' 
  AND token = '3dA6+DwtlNkDkDAbBtvp37eAicrQT9ACP5/UY5tgSiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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