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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f4f1fa254210d59c972b335149ed501a831957c2053c24ac5f5acfb51bd3b66' 
  AND token = '574o/N5KFMd0W+op+Q/wN3csFW7LEhuDIpnJL9J7mZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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