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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cdf6e73d3aa2e8fa839be8cef4d31617a48969d1b22ca28161ab21497ace01f' 
  AND token = '2CJcQKU56fzzB4+cQTt5tIQbpUYd5NqZcn7zA7Lc6CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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