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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0ee2052b7e4f55189ca00cf6f46d5ae8c0349a8c94f7e04f1a1dc4b2180a782' 
  AND token = '2QBs7k3zHYW++cZlE5tjpqQd6Js9dwjkhYpENgfjeps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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