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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c45ba9b7c6f5f8ddce549b088a0956b29cf9db842ea181cd1a2f77de7c4afdd0' 
  AND token = '3iNAEBkTSGnNtT/dh0oxXPwI5w/JFcGgJll8c55r9q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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