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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94f728392c68e73453056078314a8c3e324760663a3e65eb3f85288ae1edebe0' 
  AND token = '8cSXrbsii1nEqMubFbGEhsG8eEWo/7aq1/kPHRU72cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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