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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd7c345bee1bd38b9377eb2fb45799e7b67283805f1d6478e7cff4b581b5aaf5' 
  AND token = '9F387zo9nCXG8oxO6J+zCjXtPEtiWQosaWWXpM5E6Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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