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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '272c12d880990a7dba097e8f505ea2b174b73731a037a56ec1685cc6f7750b69' 
  AND token = '+5VK1wRezNOSMIrJtI021xiyMD3PvDRTXZw57Dx4bq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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