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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '255fec0c4d3dd537843fab80350fed031a5a08da26f28375bc39ca611adf31f8' 
  AND token = 'xvW5ADu5U+OUeRoYJ74qnf8fO6siVhxUGhXdtr1mcmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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