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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28cbcc93ed5d33c601706e21bc3606a0483c7ec2e2afc56899a6d1c746549708' 
  AND token = 'P/gU9iISEktzEAEkr4/DlxqbA0IdaMmK5MrwB/UmbUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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