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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02ca9cdd68e9db3a229988b16bb8da50e859e6be121c9e74569f768e19482e29' 
  AND token = 'znybFr/yyP5O8dw8USJPXE1alpR3MhqhK6mm4PWdlnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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