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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '126c7cfda35c73086270f60b93ed9e988cea79352b6dcd549097270c93bd0849' 
  AND token = 'DitM8OGMTX7UlK238OrONHPsKppSE0rlfyqYnxFsNwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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