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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc17f38980024bdf9759a0abbdab687cd2f8e4d88ee70fb99a2bf668e30524ed' 
  AND token = 'imtK2VkCdASuCrT/6x4bJMxPCyIgfxcan0Kbhd/fNPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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