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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55b817faaeae0e8a5ff49819c0288ffefca0bb7e3e44d90a6bf33f5a06caa05' 
  AND token = '2XP025y7ZsyTNjOKfMsfaH1cF8dLZ8uqqyD2KvuQiH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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